You have three Windows Server Update Services (WSUS) servers named Server01, Server02, Server03.
Server01 synchronizes from Microsoft Update.
You need to ensure that only Server02 and Server03 can synchronize from Server01.
What should you do on Server01?
A.
Modify %ProgramFiles%\\Update Services\\ WebServices\\serversyncwebservice\\Web.config.
B.
From the Update Services console, modify the Automatic Approvals options.
C.
Modify %ProgramFiles%\\Update Services\\ WebServices\\serversyncwebservice\\SimpleAuth.asmx.
D.
From the Update Services console, modify the Update Source and Proxy Server options.
Explanation:
https://technet.microsoft.com/en-us/library/hh852346(v=ws.11).aspx
D looked wrong to me because the action should be performed on downstream servers
Found out that you can do it the A way … never tested it though
https://technet.microsoft.com/ru-ru/library/dd939849(v=ws.10).aspx
A